Parachute Fabric Dine Sh

8/7/2019 Parachute Fabric Dine Sh

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PARACHUTE FABRIC

DINESH YADAV


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INTRODUCTION

Para-chute

Slow down movement

High altitude , horizontal Weight

Balance between gravity andair resistance

Flexible fabric


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COMPONENTS OF APARACHUTE


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CONTINUE

LOW SPEED HIGH SPEED


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CONSIDERATION OFMATERIAL

FORC

E

ON

PAYL

OAD


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CANOPY MATERIAL

Canvas

Silk

Nylon Polyester

Kevlar

Nomex Spectra


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CANVAS-SILK

Thinner

Lighter

Stronger Fire-resistant

Easily foldable


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SILK-NYLON

%TRAIN


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NYLON

Lightweight and very strong

Excellent elastic recovery

Durable Smooth

Dries quickly

Resistant to abrasion andchemicals


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STRAIN RATE

%TRAIN


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POLYESTER

High density

Low elongation

High static charge


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KEVLAR

High strength , modulus,melting temp

Less stretch-harder opening Low abrasion resistance

Difficult to handle and cut

Low UV resistance


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DYNEEMA & SPECTRA

Lighter

Creep

Low elongation Low melting temp


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%TRAIN


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Parameter Silk (olyamide)ylon 66 Polyester Polypropylene

ork of( / )upture j g .9 7 77 119 71reaking (%)xtension .3 4 46 15 17lexuralrigidity( N mm2/tex2)

.60 . .15 0 22 .30 .51pecific(ravity /cm3) .34 .14 .39 .91pecific( / )eat j gK .38 .43 .03 .46oisture(%)egain 10 .1 .4 0


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NYLON

Melting

Coating with silicone

Tearing strength


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FABRIC PROPERTIES

Tearing strength

Air permeability


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WEAVE Rip-stop weave

Plain weave

Multiple threads woven

Box like pattern

Small tears


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AIR PERMEABILITY Time of descent

Reduced shock on opening-Highly permeable fabric aroundthe central canopy vent . A

strip of low porosity fabricaround the hem line

Stable opening- Less permeable-

porous canopy Safe loading- Opening

characteristics and on the dragduring the uniform descent

-


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CALENDERING

Scoured-dyed-dried

Calendering-rolling under

pressure and heat Temp-150oc

Spread out-come closer

Determines permeability


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SUSPENSION LINES

R A ID E D N Y LO N C O R DO W C O S TIG H D U R A B ILIT YIG H S H O C K A B S O R P T IO N


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SEWING THREAD

Cotton

Nylon

Kevlar Spectra


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NONWOVEN

Bulky

Low elastic recovery

Bond strength between yarns Control on air permeability


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ELECTROSTATIC FORCES

IND VELOCITY MPH


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Material 70 Denier, High Tenacity, Bright Nylon,

Melting Point 489F + Or - 10F

Weave Pattern Rip Stop 7.5 Minimum Repeats Per Inch

WEIGHT (Max.) 1.17 Osy

Thickness(max.) .0030 Inches

STRENGTH (Min.) 47 X 47 Pounds

ELONGATON (Min.) 25%

TEAR STRENGTH (Min.) 5 X 5 Pounds

Air Permeability .5-3.5 Cfm

Ph 5.5-9.0

Color Fastness Good (Regular Colors)

Heat/Light Resistance Max. 25% Change

inish rethane Coating


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REFERENCES1.Science and technology by marshall cavendish corporation2.The transition from silk to nylon for parachutes during world war second by

ernest r. kaswell, albany international research, reston, va., Textile chemist and colorist s.

american dyestuff reporter volume no 23.The electrostatics of parachutes , Mark N. Horenstein , Norman Roberts,

Journal of Electrostatics 34 (1995) 205-2244.Effect of folding on the strength of kevlar29 and nylon parachute materials ,R. H. Ericksen , Fibre Science and Technology 15 (1981) 161-

1725.United states patent, stevenson et al. ,march 5,19746.Air permeability of parachute cloths m.j. goglia, h.w.s. lavier and c.d.

brown1955 25: 296 textile research journal7.Aerodynamic properties of screens and fabrics s.f. hoerner 1952 22: 274

textile research journal8 Effect of number of filaments in yarn and cloth sett on certain fabric

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Parachute Fabric Dine Sh